OUTLINE: This is a dose-escalation, multicenter study. Patients receive KSA-interleukin-2 (KSA-IL-2) IV over 1 hour on days 1-5. Treatment repeats every 21 days for a maximum of 6 courses in the absence of disease progression or unacceptable toxicity. Cohorts of 3-6 patients receive escalating doses of KSA-IL-2 until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which more than 33% of the patients experience a dose-limiting toxicity. Patients are followed at 30 days.